An arenavirus is any of a group of RNA virus of the genus Arenavirus, most of which cause severe diseases transmitted by rodents.
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Lassa virus (LASV) causes Lassa fever. It's an arenavirus.
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Junín virus an arenavirus http://en.wikipedia.org/wiki/Argentine_hemorrhagic_fever
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Viruses of the Arenaviridae family cause the Argentinian,
Brazilian, Bolivian, and Venezuelan hemorrhagic fevers. Lassa
fever, which occurs in west Africa, also arises from an
arenavirus.